Method and apparatus for automatic solid state drive performance recovery

Abstract

A method and apparatus are disclosed for automatic solid state drive performance recovery. A detection module detects a first SSD exceeding a fragmentation threshold. A plurality of drives comprises the first SSD and stores a data copy of data stored on the first SSD. An erase module erases a mapping table for the first SSD. The mapping table maps Logical Block Addresses LBA to physical addresses for the first SSD. A rebuild module rebuilds the data and the mapping table on the first SSD from the data copy.

1. A computer readable storage medium storing a computer readable program on a tangible storage device, wherein the computer readable program when executed on a computer causes the computer to recover performance by:
 detecting a first solid state drive (SSD) exceeding a fragmentation threshold, wherein a plurality of drives comprises the first SSD and stores a data copy of data stored on the first SSD; 
 erasing a mapping table for the first SSD in response to detecting the first SSD exceeding the fragmentation threshold, the mapping table mapping logical block addresses (LBA) to physical addresses for the first SSD, so that no physical addresses are identified for each LBA; and 
 rebuilding the data and the mapping table on the first SSD from the data copy. 
 
     
     
       2. The computer readable storage medium of  claim 1 , wherein each drive of the plurality of drives stores a portion of the data copy. 
     
     
       3. The computer readable storage medium of  claim 1 , wherein the fragmentation threshold is detected when a specified fragmentation time interval is exceeded. 
     
     
       4. The computer readable storage medium of  claim 1 , wherein the fragmentation threshold is detected when a specified fragmentation time interval is exceeded and a specified inactivity is detected. 
     
     
       5. The computer readable storage medium of  claim 1 , wherein the fragmentation threshold is detected when a performance of the first SSD is less than a specified performance threshold. 
     
     
       6. The computer readable storage medium of  claim 5 , wherein the performance of the first SSD less than the specified performance threshold is determined from a status flag. 
     
     
       7. The computer readable storage medium of  claim 1 , wherein the computer readable program further causes the computer to rebuild the data on the first SSD with contiguous portions of the data organized in blocks of a specified size. 
     
     
       8. The computer readable storage medium of  claim 1 , wherein the plurality of drives are each SSD. 
     
     
       9. An apparatus comprising:
 a detection module detecting a first SSD exceeding a fragmentation threshold, wherein a plurality of drives comprises the first SSD and stores a data copy of data stored on the first SSD; 
 an erase module erasing a mapping table for the first SSD in response to detecting the first SSD exceeding the fragmentation threshold, the mapping table mapping LBA to physical addresses for the first SSD, so that no physical addresses are identified for each LBA; and 
 a rebuild module rebuilding the data and the mapping table on the first SSD from the data copy. 
 
     
     
       10. The apparatus of  claim 9 , wherein the fragmentation threshold is detected when a specified fragmentation time interval is exceeded. 
     
     
       11. The apparatus of  claim 9 , wherein the fragmentation threshold is detected when a specified fragmentation time interval is exceeded and a specified inactivity is detected. 
     
     
       12. The apparatus of  claim 9 , wherein the fragmentation threshold is detected when a performance of the first SSD is less than a specified performance threshold. 
     
     
       13. The apparatus of  claim 12 , wherein the performance of the first SSD less than the specified performance threshold is determined from a status flag. 
     
     
       14. The apparatus of  claim 9 , the rebuild module rebuilding the data on the first SSD with contiguous portions of the data organized in blocks of a specified size. 
     
     
       15. A method comprising:
 detecting a first SSD exceeding a fragmentation threshold, wherein a plurality of drives comprises the first SSD and stores a data copy of data stored on the first SSD; 
 erasing a mapping table for the first SSD in response to detecting the first SSD exceeding the fragmentation threshold, the mapping table mapping LBA to physical addresses for the first SSD, so that no physical addresses are identified for each LBA; and 
 rebuilding the data and the mapping table on the first SSD from the data copy. 
 
     
     
       16. The method of  claim 15 , wherein the fragmentation threshold is detected when a specified fragmentation time interval is exceeded. 
     
     
       17. The method of  claim 15 , wherein the fragmentation threshold is detected when a specified fragmentation time interval is exceeded and a specified inactivity is detected. 
     
     
       18. The method of  claim 15 , wherein the fragmentation threshold is detected when a performance of the first SSD is less than a specified performance threshold. 
     
     
       19. The method of  claim 18 , wherein the performance of the first SSD less than the specified performance threshold is determined from a status flag. 
     
     
       20. The method of  claim 15 , further comprising rebuilding the data on the first SSD with contiguous portions of the data organized in blocks of a specified size.